2.) Update xen config to add new partition to guest os. Assign device name to it, example “xvda3”. Then re-create the VM to recognize the new partition/device. Note: reboot doesn’t read the new xen configuration.

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disk = [
'phy:/dev/vg0/extra_storage,xvda3,w',

3.) After you reboot, login to VM and mount the new partition. New drive or partition shoud be in “/dev/xvda3.”